2 results about "S system" patented technology

Techniques for secure booting of Unified Extensible Firmware Interface (UEFI)-compliant devices are described. In one example, execution of a driver associated with a hardware component of a computing device can be detected during boot of the computing device. Based on the detection, a first driver hash of the UEFI's system table can be calculated, where the system table is a data structure that stores configuration details of the computing device and UEFI services. Thereafter, based on detecting completion of the driver's execution, a second driver hash of the system table can be calculated. The first driver hash and the second driver hash can then be compared to determine tampering with the UEFI's system table.

This invention proposes a method for clock calibration of an SPI device, comprising the following steps: Step 1: When the master device in the SPI device performs a write operation, the master device pulls the CSN signal low and provides 48 consecutive SCK clock signals; after the slave device detects that the CSN signal is low, it starts counting from the rising edge of the first SCK clock signal, and the counter starts counting from 0; the counting frequency is the high-frequency clock f inside the slave device. HSI When the slave device detects the 48th SCK clock signal, the counter stops counting and stores the count value CNT in the slave device's register; Step 2: The master device reads the count value CNT held in the slave device's counter register; Step 3: Calculate the slave device's system clock f based on the count value. HSI Step 4: The master device writes the correction compensation value, i.e., the correction frequency mentioned in step 3, into the corresponding address of the slave device's register to complete the clock correction.